RBI Series
Pressure sensors with analog and digital output
FEATURES
· 0...10 inch H
2
O to 0...100 psi,
0...±5 inch H
2
O to 0...±100 psi,
absolute, gage or differential pressure
· 0.5...4.5 V analog output and digital
readout via I
2
C-bus
· Precision ASIC signal conditioning
· Temperature compensated
· Sensortechnics PRO services
MEDIA COMPATIBILITY
To be used with non-corrosive, non-ionic working
fluids such as clean dry air, dry gases and the like.
SPECIFICATIONS
Maximum ratings
Supply voltage V
S
max. 6.50 V
DC
Output current
Sink
Source
Lead temperature (2 - 4 sec.)
Temperature ranges
Compensated
Operating
Storage
Vibration
Shock
RBAP...
RBAH...
4.75 V to 5.25 V
DC
ELECTRICAL CONNECTION
+Vs
N/C
2 mA
2 mA
250 °C
0 to +85 °C
-20 to +105 °C
-40 to +125 °C
10 g at 20 - 2000 Hz
100 g for 11 ms
50 g for 11 ms
6
1
5
SCL
SDA
Vout
15 nF
220 nF
RBI
8 4
3
7
2
N/C
GND
Note:
Capacitor 220 nF required between +Vs
and GND and 15 nF between Vout and GND.
It is important to place the capacitors as close
to the pins as possible!
Pins 4, 6 and 8 are internal device connections
and should not be connected for any reason!
Caution!
The sensors are not reverse polarity protected.
Incorrect applications of excitation voltage or ground
to the wrong pin can cause electrical failure.
Application of supply voltage above the maximum
can cause electrical failure.
E / 11718 / A
1/9
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RBI Series
Pressure sensors with analog and digital output
PRESSURE RANGES SPECIFICATIONS
(V
S
= 5.0 V
DC
, T
A
= 25°C, analog output signal is
ratiometric
to V
S
, digital output signal is
not ratiometric
to V
S
)
Part number
RBIH005DB
RBIH010DB
RBIH010DU
RBIP015AU
RBIP030AU
RBIP100AU
RBIP001(G,D)U
RBIP005(G,D)U
RBIP015(G,D)U
RBIP030(G,D)U
RBIP100(G,D)U
RBIP001DB
RBIP005DB
RBIP015DB
RBIP030DB
RBIP100DB
Pressure range Burst pressure
1
0...±5
0...±10
0...10
0...15
0...30
0...100
0...1
0...5
0...15
0...30
0...100
0...±1
0...±5
0...±15
0...±30
0...±100
psi(d)
psi(g)
psi(a)
"H
2
O
3
3
3
30
60
150
5
20
30
60
150
5
20
30
60
150
psi(d)
psi(g)
psi(a)
p si
0.400
0.200
0.400
0.267
0.133
0.040
4.00
0.80
0.267
0.133
0.040
2.00
0.40
0.133
0.067
0.020
Sensitivity (typ.)
328
V/
"H
2
O
164
328
218
109
33
3277
655
218
V/psi
109
33
1638
328
109
55
16
counts/
p si
counts/
"H
2
O
Specification notes:
1.
If maximum burst pressure is exceeded, even momentarily, the package may leak or burst, or the pressure sensing
die may fracture.
2.
Full Scale Span (FSS) is the algebraic difference between the output signal for the highest and lowest specified pressure.
3.
Total accuracy is the combined error from offset and span calibration, linearity, pressure hysteresis, and temperature
effects. Linearity is the measured deviation based on a straight line. Hysteresis is the maximum output difference at any point
within the operating pressure range for increasing and decreasing pressure. Calibration errors include the deviation of offset
and full scale from nominal values.
4.
Delay time between sampling and signal change at the output.
5.
The smallest change in the output voltage, given any change in pressure.
6.
This is the maximum temperature shift for offset when measured between 0...85 °C relative to the 25 °C reading.
E / 11718 / A
2/9
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RBI Series
Pressure sensors with analog and digital output
PERFORMANCE CHARACTERISTICS
(V
S
= 5.0 V
DC
, T
A
= 25°C, analog output signal is
ratiometric
to V
S
, digital output signal is
not ratiometric
to V
S
)
All RBIH...
Characteristics
Total accuracy (0...85 °C)
3
Temperature effect on offset
6
Sample rate
Response delay
4
Quantization step
5
Current consumption
100
2.73
3
6
14.11
Min.
Typ.
Max.
±2.5
±100
Units
%FSS
mV
Hz
ms
mV
mA
All RBIH...U (unidirectional devices)
Characteristics
Zero pressure offset
Full scale span (FSS)
2
Full scale output
Zero pressure offset
Full scale span (FSS)
2
Full scale output
3604
4.40
327
Min.
0.40
Typ.
0.50
4.00
4.50
410
3277
3686
Max.
0.60
Units
A N A L O G U E P E R F O R M A N C E C H A R A C T E R IS T IC
V
4.60
492
counts
3768
D IG IT A L P E R F O R M A N C E C H A R A C T E R IS T IC
All RBIH...B (bidirectional devices)
Characteristics
Zero pressure offset
Full scale span (FSS)
2
Output
at max. specified pressure
at min. specified pressure
Zero pressure offset
Full scale span (FSS)
2
Output
at max. specified pressure
at min. specified pressure
Min.
2.40
4.40
0.40
1966
3604
327
Typ.
2.50
4.00
4.50
0.50
2048
3276
3686
410
Max.
2.60
4.60
0.60
2130
3768
492
Units
A N A L O G U E P E R F O R M A N C E C H A R A C T E R IS T IC
V
D IG IT A L P E R F O R M A N C E C H A R A C T E R IS T IC
counts
E / 11718 / A
3/9
www.sensortechnics.com
RBI Series
Pressure sensors with analog and digital output
PERFORMANCE CHARACTERISTICS
(V
S
= 5.0 V
DC
, T
A
= 25°C, analog output signal is
ratiometric
to V
S
, digital output signal is
not ratiometric
to V
S
)
All RBIP...
Characteristics
Total accuracy (0...85°C)
3
Temperature effect on offset
6
Sample rate
Response delay
4
Quantization step
5
Current consumption
RBIP...GU, ...DU, ...DB
100
2.73
3
6
14.11
Min.
Typ.
Max.
±2.0
±80
Units
%FSS
mV
Hz
ms
mV
mA
All RBIP...U (unidirectional devices)
Characteristics
Zero pressure offset
Full scale span (FSS)
2
Full scale output
Zero pressure offset
Full scale span (FSS)
2
Full scale output
3624
4.42
347
Min.
0.42
Typ.
0.50
4.00
4.50
410
3276
3686
Max.
0.58
Units
A N A L O G U E P E R F O R M A N C E C H A R A C T E R IS T IC
V
4.58
473
counts
3750
D IG IT A L P E R F O R M A N C E C H A R A C T E R IS T IC
All RBIP...B (bidirectional devices)
Characteristics
Zero pressure offset
Full scale span (FSS)
2
Output
at max. specified pressure
at min. specified pressure
Zero pressure offset
Full scale span (FSS)
2
Output
at max. specified pressure
at min. specified pressure
Min.
2.42
4.42
0.42
1985
3624
347
Typ.
2.50
4.00
4.50
0.50
2048
3276
3686
410
Max.
2.58
4.58
0.58
2111
3750
473
Units
A N A L O G U E P E R F O R M A N C E C H A R A C T E R IS T IC
V
D IG IT A L P E R F O R M A N C E C H A R A C T E R IS T IC
counts
E / 11718 / A
4/9
www.sensortechnics.com
RBI Series
Pressure sensors with analog and digital output
INTRODUCTION
The RBI is capable to generate a digital output signal. It
runs a cyclic program, which will store a corrected 12-bit
sensor value about every 10 ms within the output registers
of the internal ASIC. In order to use the pressure transducer
for digital signal readout, the device should be connected
to a bidirectional I²C-bus.
According to the I²C-bus communication specification, the
bus is controlled by a master device, which generates the
clock signal, controls the bus access and generates START
and STOP conditions. The RBI is designed to work as a
slave, hence it will only respond to requests from a master
device.
The I²C-bus master-slave concept requires a unique
address for each device. The RBI has a hard coded slave
address (1111000xb), therefore it is
not
possible to access
more than one RBI on the same I²C-bus line.
STOP condition (P):
LOW to HIGH transition of SDA line while
clock (SCL) is HIGH determines STOP condition. STOP
conditions are always generated by the master. More than
one request for the current pressure value can be trans-
mitted without generation of intermediate STOP condition.
DATA valid (D):
State of data line represents valid data when,
after START condition, data line is stable for duration of
HIGH period of clock signal. Data on line must be
changed during LOW period of clock signal. There is
one clock pulse per bit of data.
Acknowledge (A):
Data is transferred in pieces of 8 bits
(1 byte) on serial bus, MSB first. After each byte receiving
device – whether master or slave – is obliged to pull
data line LOW as acknowledge for reception of data.
Master must generate an extra clock pulse for this pur-
pose. When acknowledge is missed, slave transmitter
becomes inactive. It is on master either to send last com-
mand again or to generate STOP condition in that case.
Slave address:
Each device connected to the bus has a
unique slave address. After generating a START con-
dition, the master has to transmit the slave address for
the RBI with a READ command: $F1. The RBI must not
be accessed with a WRITE command ($F0) as the
correct function of the device can not be guaranteed in
this case (note: a power-down power-up change will
force the sensor to use factory data again).
DATA operation:
The RBI starts to send 2 data bytes containing
the current pressure value placed in the output registers.
DIGITAL I
2
C INTERFACE
The RBI complies with the following protocol (FIGURE I):
Bus not busy:
During idle periods both data line (SDA) and
clock line (SCL) remain HIGH.
START condition (S):
HIGH to LOW transition of SDA line
while clock (SCL) is HIGH is interpreted as START con-
dition. START conditions are always generated by the
master. Each request for the current pressure value must
be initiated with a START.
SCL
SDA
START
condition
Data
valid
Data allowed
to change
STOP
condition
1
S Slave Address R/W A
Data Byte 1
A
Data Byte 2
S
Slave Address
Next command
P
Read out of pressure value
generated by master
generated by slave
S = START condition
A = Acknowledge
P = STOP condition
Data Byte 1 = High Byte (MSB first)
Data Byte 2 = Low Byte (LSB last)
FIGURE I:
I²C-BUS Protocol
E / 11718 / A
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